While collective memory is usually grounded in fact, it need not be. I — Margaret MacMillan

"History does not produce definitive answers for all time. It is a process."

"How groups of humans contemplate and plan for wars is also affected by their culture, including geography. Island nations or those with long coasts have understood and invested heavily in sea power. In the case of Britain, its navy – tellingly called the Senior Service – has absorbed more resources and had much greater prestige over the centuries than its army. While paintings, poems, films and histories memorialise the great naval battles – Salamis, Lepanto, Trafalgar, Midway – when one navy destroyed another, the main strategic purpose of navies is to control the seas, and the highways that criss-cross them, and prevent their enemies from doing so. Even today land communications are vulnerable to disruption, either man-made or natural; how much more so in the past before surfaced roads and railways?"

"The Persians were to learn in the most costly manner just what that Greek way of war could do to an enemy. ... Centuries later knights on horseback were to learn a similar lesson in fighting from the massed infantry of Swiss soldiers who, like the Greek hoplites before them, fought with and for each other as equals. We now think of the Swiss Guards who stand on duty at the Vatican in their multicoloured Renaissance uniforms as a charming detail and Switzerland as peaceful and bucolic, home to good chocolate, discreet banks and, as the character Harry Lime in The Third Man unkindly says, the cuckoo clock. For 200 years, until a square was finally broken in 1515, the Swiss formations, bristling with pikes and sheltering archers with their deadly crossbows, were the terror of Europe and the key to victory, at least for anyone who could afford to hire them. ‘Pas d’argent, pas de Suisse,’ as the saying went."

"The assumption that it is the men who should be warriors seems to be almost universal through time and across cultures and, while there are examples of women warriors, the overwhelming majority of those who have fought are men. And when rules of war have developed in different societies, women, along with old people, children and, sometimes, priests have been classified as non-combatants. The reasons why men have largely done the fighting and women have not are as much debated as the origins of war itself, and again the explanations range from the biological to the cultural. If gender differences are averaged, men come out higher on the scale of strength and size and possibly aggression, but there are many big strong women who can match and surpass men. The fact that men have more testosterone than women may make them more prone to being aggressive – although scientists are far from reaching a consensus – but there are many men who are gentle by nature and do not want to fight. Militaristic societies such as Sparta or the military through the ages would not have spent so much time on training which inculcates the ‘right’ attitudes if the great majority of men were natural-born killers. Women, when they choose or are obliged to fight, can be as fierce as men."

"War has its own laws and one of the oldest and most persistent is that those who have surrendered and civilians, where possible, should be spared. Yet we all know the stories or have seen pictures of the sacking of cities, the execution of prisoners of war, the shelling of churches filled with refugees, or the farm buildings deliberately set on fire, and we remember names such as Oradour or Wounded Knee or Nanjing. For any American who lived through the Vietnam War the incident at My Lai, when a representative group of ordinary American soldiers rampaged through a village, has come to represent the barbarism of much of that war. (The Vietnamese forces committed their own atrocities, but Vietnam has been slow to come to terms with them.) In 1968 American reporters in the country started to hear stories about the murder in cold blood of some 500 villagers, of all ages, by an American patrol. One courageous helicopter pilot who was there did his best to save the Vietnamese and later filed a report with his superiors, who did nothing."

"In Canada not everyone will agree with Harpers interpretation of what Vimy means for today. We have a multiplicity of views about the past and its significance for the present. In China, by contrast, the Communist Party does its best to ensure that the public gets only one version of history. When my book on Nixon’s trip to China in 1972 came out, Chinese publishers showed an interest in translating it. There would, however, have to be a few small changes. Mention of the Cultural Revolution and of Mao’s often scandalous private life would have to go. (The book has not been published in China.) Although the Communist Party has repudiated most of Mao’s policies, it still holds him up as the father of the Communist Revolution. To question him would be to undermine the Party’s own authority to rule China."